Daniel yeld wheatley



Patented Oct. 6, 1925.

UNITED STATES DANIEL YELD WHEATLEY, OF ASHFORD, ENGLAND.

MAGNETO' FOR INTERNAL-COMBUSTION ENGINES.

Application led May 6, 1925.

T 0 all whom z't may concern.'

Be it known that I, DANIEL YELD WHEAT- LEY, a British subject, residing at Goldenhurst, Aldington, Ashford, Kent, England, have invented certain new and useful Improvements in or Relating to Magnetos for Internal-Combustion Engines, of which the following is a specification.

This invention relates to magnetos for internal combustion engines and of that kind in which impulse starters are employed and in which means is provided for holding the usual catch out of engagement until the engine has stopped.

In magnetos fitted with these impulse starters it has been proposed to use a gravity or other catch which will hold the armature in the maximum sparking condition when the engine is started up said catch being then released and being inoperative until the engine is stopped.

I have found by experience that if the engine is turning over slowly the catch is likely to re-engage and the operations of the magneto are erratic or of a flickering nature.

According to the present invention I provide means whereby the catch, whether gravity or spring controlled and which is held out of engagement until the engine has stopped is then automatically placed for reuse by the engine itself so as to be ready for restarting.

It is well known that when an internal combustion engine stops there is a small reverse rotary movement due I believe-to compression, and the distinctive feature of my invention is that I employ this reverse movement to operate any suitable means for releasing tlie catch.

As an example of my mechanism I provide adjacent to the magneto a disc, segment or the equivalent which has limited rotary movement and is provided with a stop or equivalent which will engage the catch and hold it inoperative until the engine stops, at which time the small reverse movement is communicated to the disc or equivalent and the stop is Withdrawn and allows the catch to become engaged again ready for starting. To make the engaging action of the catch more positive I form a projection on it which is adapted to co-operate with a proj ection on the disc or equivalent so that upon the disc having the slight reverse movement imparted to it the disc projection strikes the Serial No. 28,472.

catch projection and causes said catch to drop into its engaging position.

The said disc or equivalent may have light frictional contact with the armature spindle or coupling and this is sutlicient to eiliect its limited rotary movement into and out of engagement with the catch.

It' desired the said disc, plate or equivalent may be rotated ilrom any suitable part of the engine.

I will now describe my invention with reterence to the accompanying drawings, in which three views of the same construction are shown.

Fig. l shows a front view of my impulse starter in the stationary or stopped-engine position.

Fig. 2 shows the same device in the position it takes upon the initial turning or cranking of the engine and Fig. 3 shows the device in the engine-running position.

In Figs. l and 2 the magnet of the magneto is shown at fc and the armature in all figures at a, the magnet being omitted in Fig. 3.

The gravity catch a and notched disc Z) are of substantially known type and the catch is adapted to engage the notches c in the said disc in usual manner and to be lifted out of the notch it has engaged by means of one of the projections d on coupling member e. A spring, not shown, is arranged in usual or convenient manner between the disc and the coupling member e, said spring being attached to the pin 7.

In this example of my invention I provide a segment l, held by its own weight against the dise o. Limited rotary movement of the segment is possible and is controlled by the stop 2 and recess .3. The seg'- ment l is provided with a hinged stop 4 adapted to hold the catch a out of engagement with the notches as seen in Fig. 3.

IVhen the engine stops there is a small reverse movement, as above mentioned, of the disc Z) which is frietionally communicated to the segment l and turns it anti-clockwise thus removing the stop 4 from the catch a and causing the nose 5 to strike the projection 6 of the catch and throw it downwardly onto the edge ot the disc 6,' see Fig. l. Then the engine is cranked the segment moves clock- Wise with the dise Z) the latter turning sutliciently to bring one of the notches c opposite the catch a which falls into the notch and thus holds the disc against further clockwise movement. As the disc is held the coupling member e continues to turn and torsions the spring between it and the disc until one of the projections d lifts the catch out of the notch c the shape of which, more particularly the slightly rounded top to the short side, throws the catch outwardly and causes the stop 4 to turn on its hinge and allow the catch to pass. The stop returns before the catch and holds it in the disenga ed, Fig. 3, position.

ther devices may be used in place of segment l such as two short segments.arranged each side of the disc b and held in frictional engagement with it by a leaf spring connecting them together and tending to press them inwardly. A spring finger may substitute stop 4 and if desired the stop may be provided with a leaf spring to hasten its return.

What I claim is 1. A magneto for an internal combustion engine of t 4,e `kind provided-with an impulse 25 starter having a catch with means actuated by reverse movement of the engine by which the catch is released fernse.

2. A magnetopfor an internal combustion engine provided with an impulse starter hav- $0 ing a catch, and means operative in the slight reverse movement of the engine when brought to a stop for releasing said, catch forreg.

3. A magneto for an internal combusd0h engine of the kind having impulse starter 86 mechanism comprising a catch adapted to temporarily hold the mechanism when theengine is bein started in combination with means actuate by the reverse movement ,of the engine and adapted to reset the catch 0 when so actuated.

In testimony whereof I aix my signature. y

DANIEL YELD 

